Mustn’t vs. Don’t have to – English Grammar Exercises for B1
Choose the best option (A, B, C, or D) to complete each sentence. Read the conversation carefully, as all questions are part of a continuous discussion among friends planning their upcoming European adventure.
1 We are on a tight budget, but we _____ skip the famous museums; some of them are completely free on Sundays!
(a) mustn’t
(b) don’t have to
(c) shouldn’t
(d) haven’t to
2 You _____ book a first-class train ticket; the second-class seats in Europe are actually very comfortable and much cheaper.
(a) don’t have to
(b) mustn’t
(c) don’t must
(d) aren’t to
3 We _____ eat at expensive restaurants every night; we can buy fresh ingredients from the local markets and cook our own meals.
(a) mustn’t
(b) shouldn’t
(c) don’t have to
(d) don’t have
4 However, if we stay at a budget youth hostel, we absolutely _____ make loud noises in the dorm after 10 PM.
(a) don’t have to
(b) mustn’t to
(c) needn’t
(d) mustn’t
5 The hostel provides free towels for all guests, so you _____ pack one in your heavy suitcase.
(a) mustn’t
(b) haven’t to pack
(c) don’t have to
(d) wouldn’t
6 To save money on daily transport, we _____ take taxis everywhere; the metro system in Paris is excellent and affordable.
(a) don’t have to
(b) mustn’t
(c) aren’t have to
(d) couldn’t
7 We _____ pay for an expensive tour guide because I have already downloaded a great free audio tour on my phone.
(a) mustn’t
(b) don’t need
(c) shouldn’t
(d) don’t have to
8 When we visit the Vatican, we _____ wear shorts or sleeveless shirts. They have a strict dress code and will deny us entry.
(a) mustn’t
(b) don’t have to
(c) mustn’t wearing
(d) needn’t
9 We are allowed to bring our own water bottles, meaning we _____ buy overpriced drinks near the historic monuments.
(a) shouldn’t
(b) mustn’t
(c) don’t have to
(d) haven’t to
10 But remember, we _____ drink water from the decorative fountains that have a “non-potable” safety warning sign!
(a) don’t have to
(b) don’t must
(c) shouldn’t
(d) mustn’t
11 If you want to buy souvenirs, you _____ buy them at the airport; the local street markets offer much better prices.
(a) don’t have to
(b) mustn’t
(c) not have to
(d) cannot
12 We paid for our accommodation in advance online, so we _____ carry a large amount of cash with us in the city.
(a) mustn’t
(b) don’t have
(c) don’t have to
(d) wouldn’t
13 We booked a flexible flight ticket, which means we _____ pay an extra penalty fee if we decide to change our departure date.
(a) don’t have to
(b) mustn’t
(c) haven’t to pay
(d) shouldn’t
14 Please be careful in crowded tourist areas. You _____ leave your backpack open while walking around the city.
(a) don’t have to
(b) mustn’t
(c) mustn’t to leave
(d) needn’t
15 Since the museum entry is fully covered by our city pass, we _____ wait in the long line for tickets.
(a) mustn’t
(b) don’t must
(c) aren’t supposed
(d) don’t have to
16 However, we _____ lose that city pass under any circumstances, because they will not issue a free replacement!
(a) mustn’t
(b) don’t have to
(c) mustn’t losing
(d) shouldn’t
17 You _____ bring a heavy winter coat. A light jacket and some warm layers are perfectly enough for the weather in October.
(a) don’t have to
(b) mustn’t
(c) haven’t to
(d) wouldn’t
18 If we decide to rent a car for a day trip, the driver absolutely _____ ignore the local speed limits.
(a) doesn’t have to
(b) mustn’t to
(c) mustn’t
(d) doesn’t need to
19 Luckily, our rental car comes with unlimited mileage, so we _____ worry about driving too far into the countryside.
(a) mustn’t
(b) don’t have to
(c) don’t need
(d) shouldn’t
20 In conclusion, a great trip means we _____ spend a fortune to have a truly unforgettable experience.
(a) mustn’t
(b) haven’t to
(c) cannot
(d) don’t have to
ANSWER KEY & EXPLANATIONS
1 (b) don’t have to
- Why it is correct: Skipping the museums is not an obligation. The speaker is providing a cost-cutting alternative (free days) so they don’t need to skip them.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake (implies they are strictly forbidden from skipping them). (c) “shouldn’t” is a Meaning Trap (good advice, but “don’t have to” fits the structure of removing a perceived necessity). (d) “haven’t to” is a Structural Error.
2 (a) don’t have to
- Why it is correct: Buying a first-class ticket is not necessary for a comfortable trip. You lack the obligation to do so.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake (implies it is illegal or forbidden to buy first-class, which is false). (c) “don’t must” is a Structural Error. (d) “aren’t to” is a Structural Error.
3 (c) don’t have to
- Why it is correct: Eating at expensive restaurants is optional. The group has the freedom to choose a cheaper alternative (cooking).
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “shouldn’t” is a Meaning Trap. (d) “don’t have” is a Structural Error (missing “to”).
4 (d) mustn’t
- Why it is correct: Making loud noises after 10 PM breaks the hostel’s strict rules. It is prohibited.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake (implies “you don’t have to make noise, but you can if you want,” which will get you kicked out). (b) “mustn’t to” is a Structural Error. (c) “needn’t” is a Meaning Trap.
5 (c) don’t have to
- Why it is correct: The hostel provides towels, making the action of packing one unnecessary.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “haven’t to pack” is a Structural Error. (d) “wouldn’t” is a Meaning Trap.
6 (a) don’t have to
- Why it is correct: Taxis are not mandatory because the metro is available. You have a choice.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake. (c) “aren’t have to” is a Structural Error. (d) “couldn’t” is a Meaning Trap.
7 (d) don’t have to
- Why it is correct: The audio tour replaces the human guide, removing the obligation to pay for one.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “don’t need” is a Structural Error (requires “to”). (c) “shouldn’t” is a Meaning Trap.
8 (a) mustn’t
- Why it is correct: Wearing shorts violates the strict dress code of the Vatican. It is forbidden.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (c) “mustn’t wearing” is a Structural Error (requires the bare infinitive). (d) “needn’t” is a Meaning Trap.
9 (c) don’t have to
- Why it is correct: Bringing your own water removes the necessity of buying expensive drinks.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake. (a) “shouldn’t” is a Meaning Trap. (d) “haven’t to” is a Structural Error.
10 (d) mustn’t
- Why it is correct: Drinking non-potable water is a severe health hazard. It is strictly prohibited.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake (implies it’s optional, which is dangerous). (b) “don’t must” is a Structural Error. (c) “shouldn’t” is a Meaning Trap (too weak for a health warning).
11 (a) don’t have to
- Why it is correct: You are not forced to buy souvenirs at the airport; you can choose the cheaper street markets.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake (it’s not illegal to buy at the airport, just expensive). (c) “not have to” is a Structural Error. (d) “cannot” is a Meaning Trap.
12 (c) don’t have to
- Why it is correct: Since the hotel is paid for, carrying large amounts of cash is no longer a requirement.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “don’t have” is a Structural Error. (d) “wouldn’t” is a Meaning Trap.
13 (a) don’t have to
- Why it is correct: The flexible ticket removes the obligation to pay a penalty fee.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake. (c) “haven’t to pay” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
14 (b) mustn’t
- Why it is correct: Leaving a backpack open invites pickpockets. It is a strict rule of travel safety not to do this.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (c) “mustn’t to leave” is a Structural Error. (d) “needn’t” is a Meaning Trap.
15 (d) don’t have to
- Why it is correct: The pass allows you to skip the line, so waiting is unnecessary.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “don’t must” is a Structural Error. (c) “aren’t supposed” is a Structural Error.
16 (a) mustn’t
- Why it is correct: Losing the pass results in a financial loss. You are strongly warned not to lose it.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (c) “mustn’t losing” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
17 (a) don’t have to
- Why it is correct: A heavy coat is not necessary for the October weather. You can pack lighter.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake. (c) “haven’t to” is a Structural Error. (d) “wouldn’t” is a Meaning Trap.
18 (c) mustn’t
- Why it is correct: Ignoring speed limits is illegal and dangerous. It is absolutely forbidden.
- Distractor Analysis: (a) “doesn’t have to” is a Common Mistake. (b) “mustn’t to” is a Structural Error. (d) “doesn’t need to” is a Meaning Trap.
19 (b) don’t have to
- Why it is correct: Unlimited mileage means you are free from the stress of calculating distances.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (c) “don’t need” is a Structural Error (missing “to”). (d) “shouldn’t” is a Meaning Trap.
20 (d) don’t have to
- Why it is correct: Spending a fortune is not a requirement for a good trip. Budget travel provides an alternative way out.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “haven’t to” is a Structural Error. (c) “cannot” is a Meaning Trap.
GRAMMAR POINTS TO REMEMBER
1 DON’T HAVE TO (The Budget Savior – Lack of Obligation):
- Meaning: It is NOT necessary. You are not forced to do this. In travel, it usually means there is a cheaper, easier, or better alternative available. You have the freedom to choose.
- Travel Context: You don’t have to eat at expensive restaurants (we can cook). You don’t have to take taxis (we can use the metro).
- Structure: Subject + don’t/doesn’t have to + Verb (bare infinitive).
2 MUSTN’T (The Strict Rule – Prohibition):
- Meaning: Do NOT do this. It is highly dangerous, illegal, or breaks a strict rule. You have no choice.
- Travel Context: You mustn’t make noise in the hostel (you will be kicked out). You mustn’t ignore speed limits (it is illegal). You mustn’t leave your bag open (you will be robbed).
- Structure: Subject + mustn’t + Verb (bare infinitive). (Never use “to” after mustn’t).
The Travel Tip: If an action costs unnecessary money or effort, you don’t have to do it. If an action gets you robbed, arrested, or kicked out, you mustn’t do it!